Dementia Sliver

(T: Add R.)

4, T: Search your library for a Rebel permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

This creature can't be blocked except by artifact creatures and/or white creatures.

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) You can't lose the game this turn and your opponents can't win the game this turn. Until end of turn, damage that would reduce your life total to less than 1 reduces it to 1 instead.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

Flying As long as this creature is untapped, it gets +0/+2.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) Other creatures you control with flanking have flanking. (Each instance of flanking triggers separately.)

Flash Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Flying Other white creatures get +1/+1.